London: An investigation by UK's Scotland Yard of an explosive device found on the London Underground network earlier this week has uncovered a linked bomb plot in southwest England. Metropolitan Police officers cordoned off streets surrounding a property in Newton Abbot in Devon on Saturday, hours after arresting a 19-year-old in north London.

They said the operation in the small market town 200 miles from London was linked to the discovery of a “viable improvised explosive device” on a Tube train in North Greenwich, southeast London, on Thursday.